Describe the bug

The cmake build (the only option now it seems) fails with ifort 21.1 for having multiple definitions of main in fortran_test.c.

This compiler message seems important:

ifort: command line warning #10434: option '-nofor_main' use with underscore is deprecated; use '-nofor-main' instead

To Reproduce

mkdir b
cd b
CC=icc CXX=icpc FC=ifort cmake .. -Dspglib_WITH_Fortran=ON
make

Expected behavior

Uneventful completion

Environment

• Spglib's version: commit 1b1729c (the latest on devel at time of writing)
• Intel compilers version 2021.1

Additional context

I suspect the appropriate version of '-nofor_main' or actual f main need to be used.